package demo;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.FileOutputStream;

public class demo5 {
    public static void main(String[] args) {
        try {
            //得到DOM解析器的工厂实例
            DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
            //从DOM工厂获得DOM解析
            DocumentBuilder db=dbf.newDocumentBuilder();
            //解析XML文档，得到一个Document对象，即DOM树
            Document doc=db.parse("src/xml/demo1.xml");
            //找到修改的节点
            NodeList list=doc.getElementsByTagName("Brand");
            for (int i=0;i<list.getLength();i++){
                Element brandElement=(Element)list.item(i);
                String brandName=brandElement.getAttribute("name");
                if (brandElement.equals("三星")){
                    brandElement.setAttribute("name","SAMSUNG");
                }
            }
            //保存XML文件
            TransformerFactory transformerFactory=TransformerFactory.newInstance();
            Transformer transformer=transformerFactory.newTransformer();
            DOMSource domSource=new DOMSource(doc);
            //设置编码类型
            transformer.setOutputProperty(OutputKeys.ENCODING,"UTF-8");
            StreamResult result=new StreamResult(new FileOutputStream("src/xml/demo1.xml"));
            //把DOM树转换为XML文件
            transformer.transform(domSource,result);
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}
